1// RUN: %clangxx -O0 -g %s -o %t && %run %t | FileCheck %s
2#include <assert.h>
3#include <stdio.h>
4#include <string.h>
5#include <time.h>
6#include <sys/timerfd.h>
7#include <unistd.h>
8
9int main (int argc, char** argv)
10{
11 int fd = timerfd_create(CLOCK_REALTIME, flags: 0);
12 assert(fd >= 0);
13
14 struct itimerspec its;
15 its.it_value.tv_sec = 0;
16 its.it_value.tv_nsec = 1000000;
17 its.it_interval.tv_sec = its.it_value.tv_sec;
18 its.it_interval.tv_nsec = its.it_value.tv_nsec;
19
20 int res = timerfd_settime(ufd: fd, flags: 0, utmr: &its, NULL);
21 assert(res != -1);
22
23 struct itimerspec its2;
24 res = timerfd_settime(ufd: fd, flags: 0, utmr: &its, otmr: &its2);
25 assert(res != -1);
26 assert(its2.it_interval.tv_sec == its.it_interval.tv_sec);
27 assert(its2.it_interval.tv_nsec == its.it_interval.tv_nsec);
28 assert(its2.it_value.tv_sec <= its.it_value.tv_sec);
29 assert(its2.it_value.tv_nsec <= its.it_value.tv_nsec);
30
31 struct itimerspec its3;
32 res = timerfd_gettime(ufd: fd, otmr: &its3);
33 assert(res != -1);
34 assert(its3.it_interval.tv_sec == its.it_interval.tv_sec);
35 assert(its3.it_interval.tv_nsec == its.it_interval.tv_nsec);
36 assert(its3.it_value.tv_sec <= its.it_value.tv_sec);
37 assert(its3.it_value.tv_nsec <= its.it_value.tv_nsec);
38
39
40 unsigned long long buf;
41 res = read(fd: fd, buf: &buf, nbytes: sizeof(buf));
42 assert(res == 8);
43 assert(buf >= 1);
44
45 res = close(fd: fd);
46 assert(res != -1);
47
48 printf(format: "DONE\n");
49 // CHECK: DONE
50
51 return 0;
52}
53

source code of compiler-rt/test/sanitizer_common/TestCases/Linux/timerfd.cpp